Python 3.5 Tkinter How to separate 2 sets of radio buttons

my first question here.

I'm currently writing a GUI with tkinter, Python 3.5

I have a settings frame in my application and I have radiobuttons to let the user change them. There is no problem when I have only one set of radiobuttons but when I add a second set of radiobuttons, python thinks that they all belong to the same set and the user can pick only one of the 6 radiobuttons(I want the user to be able to pick a total of two,1 for each set). Is there a way to tell tkinter/python that there are 2 sets of radiobuttons? I searched stack overflow with a few keywords but most of the questions are about how to get values from radiobuttons and none of them answer my question.

Here is a example code of radiobuttons, to help you imagine the situation;

import tkinter as tk
#I'm not writing things like frames or stuff, this is just to
#tell you how my radiobuttons are categorized